There are certainly collective behaviour instincts that can kick in with groups and which can be manipulated to cause people to run amok, but it's not any group by any means.

Take for example the English Society of Friends (Quakers), and their burning collective desire to stop the Slave Trade. (& for prison reform, but that was arguably self-interest because they kept ending up in them.)

So perhaps the more interesting question is still which groups and why.